I have been trying to install some kind of network indicator to show my current bandwidth usage on the panel on top of the screen so I decided to install

But just after I have put sudo apt-get install indicator-network I have uninstalled a bunch of vital ubuntu applications e.g. network manager - which was my fault because Ubuntu warned me about it but hey! - why would it mark these applications to remove while installing just an indicator ?

Now I am unable to connect to the internet with that machine on Ubuntu. How can I install network manager back or install it from the USB boot drive with 12.04 that I have ?

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3 Answers

You don't need NetworkManager to connect to a network. Assuming you're using automatic configuration (probably you are) you just need to sudo dhclient eth0 to get an IP address (replace eth0 with your network device if that's the case).

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sudo apt-get install network-manager

Will fail. Note what dependencies are needed to install the package. Mine were-

The following NEW packages will be installed: iputils-arping libnl-route-3-200 modemmanager network-manager network-manager-gnome usb-modeswitch usb-modeswitch-data wpasupplicant

The download will fail obviously with error:

Failed to fetch
Could not resolve 'us.archive.ubuntu.com

Download all such links which gives above error including network-manager by some other system. I downloaded the following links-

The links above does not contain the link of network-manager itself. You can download it from here; from a software mirror close to you. Take care to choose the appropriate architecture (amd64 for 64-bit, i386 for 32-bit), and release version of your installed OS.

Now copy the deb files to /var/cache/apt/archives/

Run sudo-apt-get install network-manager in terminal. Now it will pick up deb files from cache and will not prompt to download them. If all goes well network-manager will be installed.

Finally reboot the system.

I had the same issue. I managed to connect to wireless like this for WPA APs

wpa_passphrase networkname password > foo.conf
killall -9 wpa_supplicant
sudo wpa_supplicant -Dwext -i wlan0 -c foo.conf

If you're using WEP then than you can do it with

iwconfig wlan0 essid network
iwconfig wlan0 key password

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